文章基本信息

标题：PACT
其他标题：I. Combining ACT andPlanckdata for improved extraction of tSZ signal
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作者：N. Aghanim ; M. Douspis ; G. Hurier 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2019
卷号：632
页码：1-10
DOI：10.1051/0004-6361/201935271
语种：English
出版社：EDP Sciences
摘要：We present the optimal reconstruction of the thermal Sunyaev–Zel’dovich (tSZ) effect signal based on the combination of a heterogeneous dataset consisting of Atacama Cosmology Telescope (ACT) andPlanckdata, with different numbers of channels, angular resolutions, and noise levels. We combine both datasets using two different approaches, a matched multifilter (MMF) technique and an optimized internal linear combination (ILC). We show that when applying the MMF to the combination of ACT andPlanckdata, the size-flux degeneracy is reduced and the signal-to-noise of clusters detected with their Sunyaev–Zel’dovich (SZ) signal improves by up to a factor of three. In the case of the optimized ILC method, we show that the tSZ map is reconstructed with a resolution of ∼1.5 arcmin. This is more than a factor two improvement compared with thePlanckresolution, and with a very good control of noise, meaning that it is limited only by the intrinsic noise of the individual experiments. The combination of ACT andPlanckdata offers a unique opportunity to improve on the study of the pressure profiles and to study substructure in clusters through their tSZ.
关键词：encosmic background radiationcosmology: observationsgalaxies: clusters: generalmethods: data analysis